Grammar Invasion_MUST and HAVE TO

• MUST is a modal verb, that means that if follows the 3 rules!

If Positive: It express a strong obligation. It is a personal obligation, it express what the speaker thinks is necessary and it is a subjective obligation.

How to build a sentence?
Subject + must + infinitive without to

You MUST work hard to get a good mark.

If Negative: It express a prohibition, something that is not allowed.

How to build a sentence?
Subject + must not/mustn't + infinitive without to
You MUSTN'T smoke at school.

There is no question form.

• HAVE TO is NOT a modal verb, the verb have in have to is not an auxiliary verb. Use don't/doesn't and didn't in negative sentences in present and past and Do/Does or Did in questions in present and past.
• REMEMBER: Only have to has a past and a future form. Must does not have a past or a future form.

If Positive: It express a strong obligation, but it is an external obligation. The obligation doesn’t come from the speaker’s opinion; another person thinks it’s necessary.

How to build a sentence? 

Subject + have/has to + infinitive without to

I HAVE TO get up at 6 a.m. on school days. (because the bus leaves at 6.40 a.m.)

If Negative: It express NO obligation. It is not necessary or required to do something, especially if you don't want to.

How to build a sentence? 

Subject + don't have to/doesn't have to + infinitive without to

You don't have to drink that juice.

He doesn't have to tidy his room today.

If Question: 

How to build a sentence? 

Present simple: Do/Does + Subject + infinitive without to? 

Do you have to get up early tomorrow? (NOT Have you to get up early tomorrow?)

Past simple: Did + Subject + infinitive without to?

Did you have to buy a new card?

No contraction!The verb have in have to cannot be contracted to ‘ve.

I have to study for the exam tomorrow. (NOT I’ve to study for the exam tomorrow.)

REMINDER:


EXTRA HOMEWOORK! CHECK IT OUT!

https://drive.google.com/file/d/1fFzw0n9jviLM5zEzvIhyx8eOURfOeynH/view?usp=sharing

Over and out.